The invention discloses a method for supporting continuous LOD drawing of a GIS (
Geographic Information System) line object and a surface object, which comprises the following steps of: initializing a spatial index by taking a point region
quadtree as a prototype, and constructing a hierarchical code through range intersection query according to a hierarchical heavy-load index node of the spatial index and an access function of data; the method comprises the following steps: independently constructing a trapezoidal grid of surface elements, improving an
algorithm, iteratively calculating the weight of each node, inputting the weight as incremental data into a
database, and constructing an element
data structure containing weight values; querying incremental data from a
database according to information such as a topological relation between a node bounding box and a
visual query window, a pixel scale and the like, and carrying out simplification or accumulative simplification on nodes; for a line, subdividing and rendering line elements from two parts of a
line segment main body and a corner pattern; and for a surface, splitting the trapezoidal grid into trapezoidal chains by using a backbone trapezoid, and simplifying and rendering surface elements under the trapezoidal grid structure. According to the method, continuous LOD high-performance drawing of the line elements and the surface elements in the
vector map can be realized.